/**
 * Copyright (C) 2007, 2008 Carnegie Mellon University and others.

 *
 * This file is part of Plural.
 *
 * Plural is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Plural is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Plural; if not, see <http://www.gnu.org/licenses>.
 *
 * Linking Plural statically or dynamically with other modules is
 * making a combined work based on Plural. Thus, the terms and
 * conditions of the GNU General Public License cover the whole
 * combination.
 *
 * In addition, as a special exception, the copyright holders of Plural
 * give you permission to combine Plural with free software programs or
 * libraries that are released under the GNU LGPL and with code
 * included in the standard release of Eclipse under the Eclipse Public
 * License (or modified versions of such code, with unchanged license).
 * You may copy and distribute such a system following the terms of the
 * GNU GPL for Plural and the licenses of the other code concerned.
 *
 * Note that people who make modified versions of Plural are not
 * obligated to grant this special exception for their modified
 * versions; it is their choice whether to do so. The GNU General
 * Public License gives permission to release a modified version
 * without this exception; this exception also makes it possible to
 * release a modified version which carries forward this exception.
 */
package edu.cmu.cs.plural.polymorphism;

import edu.cmu.cs.crystal.annotations.PassingTest;
import edu.cmu.cs.crystal.annotations.UseAnalyses;
import edu.cmu.cs.plural.annot.ClassStates;
import edu.cmu.cs.plural.annot.Perm;
import edu.cmu.cs.plural.annot.PluralAnalysis;
import edu.cmu.cs.plural.annot.PolyVar;
import edu.cmu.cs.plural.annot.ResultPolyVar;
import edu.cmu.cs.plural.annot.State;
import edu.cmu.cs.plural.annot.Symmetric;
import edu.cmu.cs.plural.annot.Unique;
import edu.cmu.cs.plural.annot.Use;


@Symmetric("p")
@ClassStates(@State(name="alive", inv="p(o)"))
//@PassingTest
@UseAnalyses({PluralAnalysis.PLURAL, PluralAnalysis.EFFECT,
	PluralAnalysis.SYNTAX, "PolyInternalChecker"})
public final class OnePlaceList {

	private Object o;
	
	@Perm(ensures="unique(this!fr)")
	public OnePlaceList(@PolyVar(value="p",returned=false) Object o) {
		this.o = o;
	}

	@ResultPolyVar("p")
	@Unique(use=Use.FIELDS)
	public Object getSome() {
		return o;
	}	
}